<?php

class Comment extends CActiveRecord {
    /**
     * The followings are the available columns in table 'tbl_comment':
     * @var integer $id
     * @var string $content
     * @var integer $status
     * @var integer $create_time
     * @var string $author
     * @var string $email
     * @var string $url
     * @var integer $post_id
     */

    const STATUS_PENDING = 1;
    const STATUS_APPROVED = 2;

    /**
     * Returns the static model of the specified AR class.
     * @return CActiveRecord the static model class
     */
    public static function model($className = __CLASS__) {
        return parent::model($className);
    }

    /**
     * @return string the associated database table name
     */
    public function tableName() {
        return '{{comment}}';
    }

    /**
     * @return array validation rules for model attributes.
     */
    public function rules() {
        // NOTE: you should only define rules for those attributes that
        // will receive user inputs.
        return array(
            array('content, author, email', 'required'),
            array('author, email, url', 'length', 'max' => 128),
            array('email', 'email'),
            array('url', 'url'),
        );
    }

    /**
     * @return array relational rules.
     */
    public function relations() {
        // NOTE: you may need to adjust the relation name and the related
        // class name for the relations automatically generated below.
        return array(
            'post' => array(self::BELONGS_TO, 'Post', 'post_id'),
        );
    }

    /**
     * @return array customized attribute labels (name=>label)
     */
    public function attributeLabels() {
        return array(
            'id' => 'Id',
            'content' => '内容',
            'status' => '状态',
            'create_time' => '创建时间',
            'author' => '作者',
            'email' => '邮箱',
            'url' => '链接',
            'post_id' => 'Post',
        );
    }

    /**
     * Approves a comment.
     */
    public function approve() {
        $this->status = Comment::STATUS_APPROVED;
        $this->update(array('status'));
    }

    /**
     * @param Post the post that this comment belongs to. If null, the method
     * will query for the post.
     * @return string the permalink URL for this comment
     */
    public function getUrl($post = null) {
        if ($post === null)
            $post = $this->post;
        return $post->url . '#c' . $this->id;
    }

    /**
     * @return string the hyperlink display for the current comment's author
     */
    public function getAuthorLink() {
        if (!empty($this->url))
            return CHtml::link(CHtml::encode($this->author), $this->url);
        else
            return CHtml::encode($this->author);
    }

    /**
     * @return integer the number of comments that are pending approval
     */
    public function getPendingCommentCount() {
        return $this->count('status=' . self::STATUS_PENDING);
    }

    /**
     * @param integer the maximum number of comments that should be returned
     * @return array the most recently added comments
     */
    public function findRecentComments($limit = 10) {
        return $this->with('post')->findAll(array(
            'condition' => 't.status=' . self::STATUS_APPROVED,
            'order' => 't.create_time DESC',
            'limit' => $limit,
        ));
    }

    /**
     * This is invoked before the record is saved.
     * @return boolean whether the record should be saved.
     */
    protected function beforeSave() {
        if (parent::beforeSave()) {
            if ($this->isNewRecord)
                $this->create_time = time();
            return true;
        }
        else
            return false;
    }

}